If the concert starts at 8 what time do the doors open?

An hour before the show, unless the artist has an issue

Depends on the show but if you look at the site u bought your tickets it normally will say.

Depends on the show and the staff. I went to see Nick Offerman a few weeks ago: show was scheduled for an 8pm start and they didnt open the doors until 7:45 pm. All that being said, they normally open an hour prior to the show. Save yourself time and don't bring a purse/bag if you can help it.

I'm pretty sure it's about an hour before the show also.

Normally an hour early